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Intermittent noise-induced hearing loss and the influence of carbon monoxide.

Authors
Chen-GD; McWilliams-ML; Fechter-LD
Source
Hear Res 1999 Dec; 138(1-2):181-191
NIOSHTIC No.
20029982
Abstract
Intermittent noise causes less hearing loss than continuous noise of equal intensity. The reduction in damage observed with intermittent noise may be explained by the fact that the auditory system has time to recover between the noise phases. Simultaneous carbon monoxide (CO) exposure produces greater noise-induced hearing loss than does noise alone (Chen and Fechter, 1999). In the present study, intermittent noise (octave-band with a center frequency of 13.6 kHz, 100 dB) of a 2 h total duration but with a different duty cycle (% of noise during exposure) was used. The intermittent exposure that had a shorter noise duty cycle induced a less permanent threshold shift (PTS) than those that had a longer noise duty cycle (or less rest periods). This relation between the loss in compound action potential (CAP) sensitivity and the noise duty cycle (or rest period) was abolished by the presence of CO. The cochlear microphonic (CM) amplitude revealed similar results to those seen using the CAP. While intermittent noise that had a short noise duty cycle did not cause hair cell loss by itself, the combined exposure to noise and CO (1200 ppm) caused remarkable OHC loss in the basal turn.
Keywords
Hearing-protection; Noise-induced-hearing-loss; Synergistic-effects; Ototoxicity; Statistical-analysis; Analytical-chemistry; Analytical-methods; Chemical-analysis; Exposure-assessment; Hearing-tests; Hearing-disorders; Noise-exposure; Noise-frequencies; Noise-levels
Contact
University of Oklahoma, Health Sciences Center, College of Pharmacy, 1110 N. Stonewall, Oklahoma City, OK 73190
CODEN
HERED3
CAS No.
630-08-0
Publication Date
19991201
Document Type
Journal Article
Email Address
guangdi-chen@ouhsc.edu
Funding Amount
561752
Funding Type
Grant
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003481
Issue of Publication
1-2
ISSN
0378-5955
Priority Area
Disease and Injury: Hearing Loss
Source Name
Hearing Research
State
OK
Performing Organization
University of Oklahoma, Health Sciences Center, Oklahoma Center for Toxicology, Oklahoma City, Oklahoma
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